Question

алгебра 4 номер помогите 25 баллов

Answer 1

$frac{(x+y)^2-4xy}{(x-y)^2+4xy} = frac{x^2+2xy+y^2-4xy}{x^2-2xy+y^2+4xy} = frac{x^2-2xy+y^2}{x^2+2xy+y^2} = frac{(x-y)^2}{(x+y)^2} =\\= frac{(666-333)^2}{(666+333)^2} = frac{333^2}{999^2} = frac{333^2}{(3cdot 333)^2} = frac{333^2}{3^2cdot 333^2}= frac{1}{3^2} =frac{1}{9}$